[clang] [RISCV] Disable rounding of aggregate return/arguments to iXLen. (PR #184736)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,c -- clang/lib/CodeGen/Targets/RISCV.cpp clang/test/CodeGen/RISCV/abi-empty-structs.c clang/test/CodeGen/RISCV/bfloat-abi.c clang/test/CodeGen/RISCV/riscv32-abi.c clang/test/CodeGen/RISCV/riscv64-abi.c --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/CodeGen/Targets/RISCV.cpp b/clang/lib/CodeGen/Targets/RISCV.cpp
index a8f0a7941..ea8000879 100644
--- a/clang/lib/CodeGen/Targets/RISCV.cpp
+++ b/clang/lib/CodeGen/Targets/RISCV.cpp
@@ -735,8 +735,8 @@ ABIArgInfo RISCVABIInfo::classifyArgumentType(QualType Ty, bool IsFixed,
       return ABIArgInfo::getDirect(
           llvm::IntegerType::get(getVMContext(), 2 * XLen));
     // Use 2-element XLen array if only XLen alignment is required.
-    return ABIArgInfo::getDirect(llvm::ArrayType::get(
-        llvm::IntegerType::get(getVMContext(), XLen), 2));
+    return ABIArgInfo::getDirect(
+        llvm::ArrayType::get(llvm::IntegerType::get(getVMContext(), XLen), 2));
   }
   return getNaturalAlignIndirect(
       Ty, /*AddrSpace=*/getDataLayout().getAllocaAddrSpace(),

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https://github.com/llvm/llvm-project/pull/184736